Rev. A
HW 10/25/02
6487 Picoammeter Specifications
TYPICAL ANALOG
5
¹⁄₂
DIGIT
ACCURACY (1YR)
1
RISE TIME (10% TO 90%)
3
DEFAULT
±(% RDG. + OFFSET)
TYPICAL
DAMPING
4
RANGE RESOLUTION
18°–28°C, 0–70% RH
RMS NOISE
2
OFF
ON
2 nA
10 fA
0.3 % + 400 fA
20 fA
4 ms
80 ms
20 nA
100 fA
0.2 % +
1 pA
20 fA
4 ms
80 ms
200 nA
1 pA
0.15 % + 10 pA
1 pA
300 µs
1 ms
2 µA
10 pA
0.15% + 100 pA
1 pA
300 µs
1 ms
20 µA
100 pA
0.1 % +
1 nA
100 pA
110 µs
110 µs
200 µA
1 nA
0.1 % + 10 nA
100 pA
110 µs
110 µs
2 mA
10 nA
0.1 % + 100 nA
10 nA
110 µs
110 µs
20 mA
100 nA
0.1 % +
1 µA
10 nA
110 µs
110 µs
Specifications are subject to change without notice.
REMOTE OPERATION
IEEE-488 BUS IMPLEMENTATION:
SCPI (IEEE-488.2, SCPI-1996.0);
DDC (IEEE-488.1).
LANGUAGE EMULATION:
Keithley Model 486/487 emulation via
DDC mode.
RS-232 IMPLEMENTATION:
Supports
: SCPI 1996.0.
Baud Rates:
300, 600, 1200, 2400, 4800, 9600, 19.2k, 38.4k, 57.6k.
Protocols:
Xon/Xoff, 7 or 8 bit ASCII, parity-odd/even/none.
Connector:
DB-9 TXD/RXD/GND.
GENERAL
AMMETER INPUT CONNECTOR:
Three lug triaxial on rear panel.
ANALOG OUTPUT CONNECTOR:
Two banana jacks on rear panel.
VOLTAGE SOURCE OUTPUT CONNECTOR:
Two banana jacks on rear
panel.
INTERLOCK CONNECTOR:
4 pin DIN.
TRIGGER LINE:
Available, see manual for usage.
DISPLAY:
12 character vacuum fluorescent.
DIGITAL FILTER:
Median and averaging (selectable from 2 to 100
readings).
RANGING:
Automatic or manual.
AUTORANGING TIME
3
:
<250ms (analog filter off, 1PLC)
OVERRANGE INDICATION:
Display reads “OVRFLOW”.
CONVERSION TIME:
Selectable 0.01 PLC to 60 PLC (50PLC under
50Hz operation). (Adjustable from 200µs to 1s)
READING RATE:
To internal buffer 1000 readings/second
1
To IEEE-488 bus
900 readings/second
1, 2
BUFFER:
Stores up to 3000 readings.
PROGRAMS:
Provide front panel access to IEEE address, choice of
engineering units or scientific notation, and digital calibration.
EMC:
Conforms with European Union Directive 89/336/EEC,
EN61326-1.
SAFETY:
Conforms with European Union Directive 73/23/EEC,
EN61010-1, CAT I.
ENVIRONMENT:
Operating:
0°–50°C; relative humidity 70% non-condensing, up to
35°C. Above 35°C, derate humidity by 3% for each °C.
Storage:
–10°C to +65°C.
WARM-UP:
1 hour to rated accuracy (see manual for recommended
procedure).
POWER:
100–120V or 220–240V, 50–60Hz, (50VA).
PHYSICAL:
Case Dimensions:
90mm high
×
214mm wide
×
369mm deep (3
1
⁄
2
in.
×
8
3
⁄
8
in.
×
14
9
⁄
16
in.).
Working Dimensions:
From front of case to rear including power
cord and IEEE-488 connector: 394mm (15.5 inches).
NET WEIGHT:
<4.7 kg (<10.3 lbs).
Notes:
1
0.01 PLC, digital filters off, front panel off, auto zero off.
2
Binary transfer mode.
IEEE-488.1.
3
Measured from trigger in to meter complete
.
TEMPERATURE COEFFICIENT:
0°–18°C & 28°–50°C. For each °C, add 0.1
×
(% rdg + offset) to
accuracy spec.
INPUT VOLTAGE BURDEN:
<200µV on all ranges except <1mV on 20mA range.
MAXIMUM INPUT CAPACITANCE:
Stable to 10nF on all nA ranges and 2µA range; 1µF on 20µA
and 200µA ranges, and on mA ranges.
MAXIMUM CONTINUOUS INPUT VOLTAGE:
505 VDC
NMRR
1
:
(50 or 60Hz) :60dB
ISOLATION (Ammeter Common or Voltage Source to chassis):
Typically >1
×
10
11
Ω
in parallel
with <1nF.
MAXIMUM COMMON MODE VOLTAGE (Between Chassis and Voltage Source or Ammeter):
505 VDC.
MAXIMUM VOLTAGE BETWEEN VOLTAGE SOURCE AND AMMETER:
505 VDC
ANALOG OUTPUT:
Scaled voltage output (inverting 2V full scale on all ranges) 2.5% ±2mV
ANALOG OUTPUT IMPEDANCE
3
:
<100
Ω
, DC-2kHz.
VOLTAGE SOURCE
Range
Step Size
Accuracy
5
Noise (p-p)
Temperature
Typical Rise
Typical Fall
(Max)
(typical)
±(% PROG. + OFFSET)
0.1 - 10 Hz
Coefficient
Time
6,8
Time
7,8
18°C - 28°C, 0 - 70% R.H.
(10%-90%)
(90%-10%)
±10.100
200µV
0.1% + 1mV
<50µV
(0.005% + 20µV) / ˚C
250 µs
150 µs
±50.500
1mV
0.1% + 4mV
<150µV
(0.005% + 200µV) / ˚C
250 µs
300 µs
±505.00
10mV
0.15% + 40mV
<1.5mV
(0.008% + 2mV) / ˚C
4.5 ms
1 ms
SELECTABLE CURRENT LIMIT:
2.5mA, 250µA, 25µA for 50V and 500V ranges, 25mA additional
limit for 10V range. All current limits are -20%/+35% of nominal.
WIDEBAND NOISE
9
:
<30mVp-p 0.1Hz - 20MHz.
TYPICAL TIME STABILITY:
±(0.003% + 1mV) over 24 hours at constant temperature (within 1°C,
between 18°C - 28°C, after 5 minute settling).
OUTPUT RESISTANCE:
<2.5
Ω
.
VOLTAGE SWEEPS:
Supports linear voltage sweeps on fixed source range, one current or resist-
ance measurement per step. Maximum sweep rate: 200 steps per second. Maximum step count
3000. Optional delay between step and measure.
RESISTANCE MEASUREMENT (V/I):
Used with voltage source; resistance calculated from voltage
setting and measured current. Accuracy is based on voltage source accuracy plus ammeter
accuracy. Typical accuracy better than 0.6% for readings between 1k
Ω
and 1T
Ω
.
ALTERNATING VOLTAGE RESISTANCE MEASUREMENT:
Offers alternating voltage resistance
measurements for resistances from 10
9
Ω
to 10
15
Ω
. Alternates between 0V and user-selectable
voltage up to ±505V.
1
At 1 PLC – limited to 60 rdgs/sec under this condition.
2
At 6 PLC, 1 standard deviation, 100 readings, filter off, capped input – limited to 10 rdgs/sec
under this condition.
3
Measured at analog output with resistive load >2k
Ω
.
4
Maximum rise time can be up to 25% greater.
5
Accuracy does not include output resistance/load regulation.
6
Rise Time is from 0V to ± full-scale voltage (increasing magnitude).
7
Fall Time is from ± full-scale voltage to 0V (decreasing magnitude).
8
For capacitive loads, add C*
Δ
V/I
Limit
to Rise Time, and C*
Δ
V/1mA to Fall Time.
9
Measured with LO connected to chassis ground.
